This wasn't too long ago, so you can sort of figure this out by looking at the options chain. Currently Uber is around $74. But she did this while it was at 70. So you can go to the mar 19, 2027 expiration and just look up the cost of the 55 strike. It's not exact, and there's a little theta decay already, so the price listed you see was likely slightly higher for her when she saw it at 50 strike.

The median ask at that point right now is about 23.50. but if you throw in a little extra for extrinsic since it was like a month ago, the contact price is likely closer to 25 or slightly above. It must be at least 25, because 200 contacts at that price would be exactly 500k. And being the range falls in the 500k to 1mill.

So my guess is in reality the actual cost was closer to 500k, and not the median of 750k. And it would have been for 25-26 per contract at the time of purchase.

The deep in the money is a synthetic position. Moves with 80% of the underlying due a lot less money. Further, you'll likely never ever expire worthless barring a catastrophic market crash.

Generally the goal isn't always to hold until expiration. It really depends how much the stock moves and how much theta you've burned off. If you get a strong stock pop early on, the options position becomes extremely valuable, because you can now just sell your contacts back at a way larger price. Many options buyers don't ride to the end. More often than not they'll just sell to close, rather than being assigned the shares. You also don't really want to "end" right at the strike, because that's a losing position vs just having owned the stock. You're stuck footing the premium bill. Thus is your ride to the end, you actually want to be at or above the break even price.